Process and apparatus for making electric condensers



Dec. 16, 1930. w. I JUBILIER PROCESS -AND APPARATUS FOR MAKING ELECTRIC CONDENSERS Filed Jan. 15, 1926 INVENTOR RNEY rials employed.

Patented Dec. 16, 1930 UNITED STATES PATENT OFFICE WILLIAM DUBILIER, OF NEW ROCHELLE, NEW YORK, ASSIGNOR T0 DUBILIER CON-.

DENSER CORPORATION, OF NEW YORK,

N. Y., A CORPORATION OF DELAWARE PROCESS AND APPARATUS FOR MAKING ELECTRIC CONDENSERS Application filed January 15, 1926. Serial No. 81,527.

This invention relates to improvements in the manner of manufacturing electric condensers; especially, condensers of constant capacity and of such a character as to require compression and impregnation with a suitable insulating substance in course of the production of the condensers.

An object of the invention is to devise a methodby which condensers of the kind mentioned can be easily and more cheaply produced, and which can be conveniently practiced by the use of inexpensive and easily obtainable materials.

The nature and scope of the invention are set forth in the following. description taken with the drawings, and the novel features of the invention are pointed out in the claims, but the disclosure is illustrative only, and I may vary the details of structure or manner of proceeding as desired within the limits of the principle by which the invention is distinguished.

On the drawings,

Figure 1 is a view showing the ordinary method of making condensers now in use;

Figure 2 is a similar View to show the method of making condensers according to this invention; and r Figures 3, 4 and 5 are similar views showing modifications of the process and mate- The same numerals identify the same parts throughout.

Referring first to Figure 1', I showa number of sections S-for the stacks or bodies of ber of sections are often combined to make up the stack of the complete condenser and for convenience in handling and finishing,the

complete stack of the condenser is produced b first making a number ofsections and tlien combining as many as may be required.

Further, in the manufacture of condensers,particularly those in which the conductive elements consist of sheets of metal foil and the insulation of mica, it is often necessary to compress the sections and then immerse'them in a bath of molten insulating material such as wax, to impregnate the sections throughout. Frequently, the immersion in the molten wax is carried out in a vacuum, so that all air can be exhausted from small spaces or voids between the sheets of foil and mica, and all such spaces and voids as may exist are then filled by the molten wax which afterwards solidifies. To eliminate as many such minute spaces and voids as possible, the process of exhaustion and impregnation is often accomplished production is desired. For this purpose, a number of sections are laid one upon the other, with separators consisting of plates of mica 4 between them. When the compression, evacuation and immersion in a bath of molten wax takes place, not only the sections themselves, but also the mica separators become covered with wax after the wax hardens; and in order to avoid the loss of the mica separators 4, these plates 4 must be saved and freed of the wax after the process of impregnation, when the sections are separated and built into a stack of the size which the design of any one particular condenser demands.

The labor required to clean the mica separators, and free them from the wax which sticks to them, is often expensive and I havefound that by the use of a wrapping 5 consisting of a ribbon ofcopper or other material, the mica separators can be dispensed with. It is only necessary to wrap each section with i strip of copper ribbon 5 large enoughto envelop the section entirely, as indicated in Figure 2. The sections can be handled together as before in any required numher, to perform the operation of compressing, evacuating and impregnating, and though the wrappings 5, in this instance too, become covered with wax, they can be removed from the different sections just as easily; and even.

. degree of compression can be obtained and the operation of evacuating and impregnating performed with the same advantage and efficiency as in the first instance.

Figure 2 shows the sections with the wrappings 5 thereon arranged lengthwise; and large enough to permit the ends of the foil 3 to protrude to the desired degree. I can also use a broader wrapping as indicated at 5 in Figure 3 and put this'wrapping 5 crosswise upon the condenser, permitting the foil ends 3 to protrude as before and still be covered by the wrapping.

I can also proceed as in Figure 4 where the foil ends 3' are both bent or folded down upon one face of the section, so that a shorter wrapping 5 suflicesto go around the length of the section.

This wrapping can be applied crosswise, in this instance too.

In Figure 5, the foil ends 3a are shown as folded down against the two opposite ,faces of the section, andthe wrapping 5 again goes around the section lengthwise of the sectlon.

In both Figures 4 and 5, the wrapping can be til) put on crosswise of the section as well as lengthwise, and the sections can be heaped up into a pile by placing them and their wrappings one upon another and compressed all together, as above-described.

The wrappings of copper need be not more than five mils in thickness and the sections piled up as shown can be compressed in a clamp or in any other suitable manner.

In this way, whenever a plurality of sections. S are wrapped with a ribbon as described in connection with Figures 2, 3, 4 and 5, and piled up together for compression and impregnation, the ends of my invention are attained.

The ribbon for wrapping the sections S need not only be copper but any other suitable material may be employed.

Having described my invention,what I believe to be new and desire to secure and protect by Letters Patent of the United States is i 1. The process of making condensers which consists 'in enveloping sections in a wrapping, piling said sections one upon another, and then treating said sections simultaneously.

2. The process of making condensers which consists in enveloping sections in a wrapping, pilmg said sections one upon another, then treating said sections simultaneously, and afterwards separating said sections from one another and removing the wrapping.

3. Theprocess of manufacturing condensers which consists in wrapping a section conthen simultaneously compressing and im-' pregnating said sections and afterwards separating said sections from one anotherand removing said wrappings.

5. The process of manufacturing condensers which consists in taking sections of conductive material separated by insulation with the ends of said sheets projecting, wrapping said sections ina strip of the same width as the section, and in a d1rect1on lengthwise of the section, to envelop the section and said projecting ends, then superposing a number of said sections so wrapped upon one another, and sub ect1 ng said sections to simultaneous treatment, to compress and impregnate said sections.

6. The process of making condensers which consists in forming sections, each consisting of elements of conduct ve material separated by insulation, causing the ends of said elements to pro ect and folding the same over upon one face of said section, covering said section Wlth a wrapping, superposing a number of said sections upon one another, and then subjecting said sections to simultaneous treatment, to compress and impregnate said sections.

7. The process of making condensers which consists in assembling sections comprising conductive sheets separated by insulation, holding such sections each in a wrapping of thin material, and then treating said sections simultaneously.

In testimony whereof I affix my signature.

WILLIAM DUBILIER. 

